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Surface carbonation of synthetic C-S-H samples: A Comparison between Fresh and Aged C-S-H Using X-ray Photoelectron Spectroscopy

Black, Leon, Garbev, Krassimir and Gee, Ian (2008) Surface carbonation of synthetic C-S-H samples: A Comparison between Fresh and Aged C-S-H Using X-ray Photoelectron Spectroscopy. Cement and Concrete Research, 38 (6). pp. 745-750. ISSN 0008-8846

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Abstract

This paper presents a continuation of studies into silicate anion structure using X-ray photoelectron spectroscopy (XPS). A series of C-S-H samples have been prepared mechanochemically, and then stored under ambient conditions for six months. Storage led to surface carbonation, the extent of which was dependent upon the calcium/silicon ratio of the fresh sample. Carbonation arose through decalcification of the C-S-H, leading to increased silicate polymerisation. The surfaces of the most calcium-rich phases (C/S = 1.33 and 1.50) underwent complete decalcification to yield silica (possibly containing some silanol groups) and calcium carbonate. Carbonation, and hence changes in silicate anion structure, was minimal for the C-S-H phases with C/S = 0.67 and 0.75.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2008 Elsevier Ltd. This is an author produced version of the published paper. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: B Calcium-Silicate-Hydrate (C-S-H) B carbonation B Crystal structure X-ray Photoelectron Spectroscopy
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)
Depositing User: Ms Caroline Wilson
Date Deposited: 16 Oct 2008 16:44
Last Modified: 08 Feb 2013 17:05
Published Version: http://dx.doi.org/10.1016/j.cemconres.2008.02.003
Status: Published
Publisher: Elsevier Science Ltd Pergamon
Refereed: Yes
Identification Number: 10.1016/j.cemconres.2008.02.003
URI: http://eprints.whiterose.ac.uk/id/eprint/4753

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